Related-Key Attacks on the Full-Round Cobra-F64a and Cobra-F64b

descriptionPublicationkeyboard_double_arrow_right Part of book or chapter of book , Conference object , Article 01 Jan 2006 Netherlands, Belgium Publisher:Springer Berlin Heidelberg

Authors: Jiqiang Lu; Changhoon Lee; Jongsung Kim;

doi: 10.1007/11832072_7

Related-Key Attacks on the Full-Round Cobra-F64a and Cobra-F64b

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Abstract

Cobra-F64a and Cobra-F64b, designed for firmware-oriented applications, are 64-bit Data-dependent Permutation based block ciphers with 128 key bits, which consist of 16 and 20 rounds, respectively. In this paper, we investigate their security against related-key attacks. Our investigation shows that the full 16-round Cobra-F64a can be broken by our related-key rectangle attack and that the full 20-round Cobra-F64b can be broken by our related-key differential attack.

Countries

Netherlands, Belgium

Related Organizations

Korea University
Korea (Republic of)
KU Leuven
Belgium
Technical University Eindhoven
Netherlands
Center for Information Security Technologies
Royal Holloway University of London
United Kingdom

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Keywords

data-dependent permutation, Technology, related-key attacks, BOOMERANG, Science & Technology, SHACAL-1, Cobra-f64b, Cobra-f64a, block cipher, DDP-BASED CIPHERS, SPECTR-H64, cosic, RECTANGLE ATTACKS, Computer Science, Theory & Methods, Computer Science, DIFFERENTIAL ATTACKS, differential cryptanalysis

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